[PATCHv4 4/6] Git.pm: allow pipes to be closed prior to calling command_close_bidi_pipe

[Michal Nazarewicz <mpn@google.com>]

From: Michal Nazarewicz <mina86@mina86.com>

The command_close_bidi_pipe() function will insist on closing both
input and output pipes returned by command_bidi_pipe().  With this
change it is possible to close one of the pipes in advance and
pass undef as an argument.

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
---
 perl/Git.pm | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/perl/Git.pm b/perl/Git.pm
index 6bc9a3c..d6e6c9e 100644
--- a/perl/Git.pm
+++ b/perl/Git.pm
@@ -426,12 +426,25 @@ Note that you should not rely on whatever actually is in C<CTX>;
 currently it is simply the command name but in future the context might
 have more complicated structure.
 
+C<PIPE_IN> and C<PIPE_OUT> may be C<undef> if they have been closed prior to
+calling this function.  This may be useful in a query-response type of
+commands where caller first writes a query and later reads response, eg:
+
+	my ($pid, $in, $out, $ctx) = $r->command_bidi_pipe('cat-file --batch-check');
+	print $out "000000000\n";
+	close $out;
+	while (<$in>) { ... }
+	$r->command_close_bidi_pipe($pid, $in, undef, $ctx);
+
+This idiom may prevent potential dead locks caused by data sent to the output
+pipe not being flushed and thus not reaching the executed command.
+
 =cut
 
 sub command_close_bidi_pipe {
 	local $?;
 	my ($self, $pid, $in, $out, $ctx) = _maybe_self(@_);
-	_cmd_close($ctx, $in, $out);
+	_cmd_close($ctx, grep defined, $in, $out);
 	waitpid $pid, 0;
 	if ($? >> 8) {
 		throw Git::Error::Command($ctx, $? >>8);
-- 
1.8.1.3.572.g32bae1f